Hole bottom vibration sampling device and operation method

Abstract

The invention relates to the technical field of geological exploration, and discloses a hole bottom vibration sampling device and an operation method. The device comprises a drilling machine chassis, a drilling machine tower, a rotary motor, a drilling rod, a slurry circulating system, a multi-core rope, a rope sealing plug, a hole bottom vibrator, a sampling barrel and the like. The high-frequency small-stroke vibration of the sampling barrel is realized through the hole bottom vibrator, and by combining the adjustment of the amplitude identifier and the ground variable-frequency controller, different geological conditions can be adapted, and the sampling quality and efficiency are improved. The slurry circulating system realizes cyclic utilization of slurry, and ensures operation safety and environmental protection. The operation method comprises the steps of early-stage preparation, sampling barrel lowering, sampling operation, slurry circulation, sampling barrel lifting and the like, and a rock and soil sample can be efficiently and accurately obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geological exploration, in particular to a bottom-hole vibration sampling device and an operation method, which are used for efficiently and accurately obtaining rock-soil samples under various geological conditions. BACKGROUND

[0002] In the geological exploration work, accurately obtaining representative rock-soil samples is crucial for geological analysis and engineering design. The currently commonly used drilling sampling processes mainly include impact sampling and rotary sampling: 1. The impact sampling cuts into the rock-soil by a gravity impactor driving a sampling cylinder, and the device has a simple structure and short sampling time, but the impact process will cause great disturbance to the soil sample, resulting in poor integrity of the obtained soil sample and difficulty in truly reflecting the original characteristics of the stratum, which affects the accuracy of subsequent geological analysis; 2. The rotary sampling uses a drill rod to drive a drill cylinder to rotate and press down for sampling, and can obtain high-quality soil samples, but this method needs to disassemble the drill rod in sections, which is complicated and low in sampling efficiency, greatly increasing the exploration cost and time cost. Therefore, it is of great practical significance to develop a device and method that can overcome the above-mentioned defects and realize high-quality and high-efficiency sampling.

[0003] A sediment sampling device with unidirectional force high-frequency micro-vibration is disclosed in the publication number CN111624020A, which relates to the field of marine instrument equipment industry, and includes a handrail frame, a lifting ring, a transverse connecting plate, an arc-shaped shell, a plane shell, a mounting block, a threaded connecting block, a balance disc, a sampling connecting column and a vibration mechanism.

[0004] The existing patent focuses on marine sediment sampling, and adopts the mode of synchronous reverse rotation of multiple eccentric wheels to eliminate multi-directional vibration in the horizontal direction and realize unidirectional force high-frequency micro-vibration. Through a complex motor transmission structure, the transmission shaft and the variable transmission gear are used to realize the synchronous operation of the eccentric wheels. However, this also leads to a decrease in synchronization during the start and stop of the motor, resulting in interference multi-directional vibration, and large invalid power consumption during transmission.

[0005] A kind of underwater vibration sampling device is disclosed in the publication number CN110926864B. The device includes a base, a sampling pipe, a vibration motor, a sliding seat and a sliding rail, the sampling pipe is hollow tubular structure, sampling pipe vertically penetrates base setting;The sliding rail is fixed to the base and is parallel to the sampling pipe;The sliding seat is arranged at the top of the sampling pipe, and is hinged with the sampling pipe, the sliding seat horizontal two sides and sliding rail sliding fit;The vibration motor seat is fixedly arranged in the sliding seat, and the vibration drives the sliding seat to move down the sampling pipe.

[0006] The existing patent for underwater sediment sampling device mainly consists of base, sampling tube, vibration motor, slide and slide rail. Through the cooperation of slide and slide rail, the motion route of sampling tube is standardized, so that it can be vertically drilled into the underwater sediment layer. The vibration motor drives the slide to press down the sampling tube for sampling, and a structure is provided to prevent sample leakage. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the above technical defects and provide a hole bottom vibration sampling device and an operating method.

[0008] 1. To solve the above problems, the technical scheme of the present application is: a hole bottom vibration sampling device, characterized in that it comprises a hole bottom vibrator, a multi-core rope, a rope sealing plug, a sampling cylinder, a drill rod, a mud circulation system, a drilling machine chassis and a drilling machine tower;

[0009] The drilling machine chassis provides a support base for the device and provides output and processing support for power, compressed air and mud circulation system. The drilling machine tower is vertically installed on the drilling machine chassis, and a multi-core rope, a rope sealing plug and a rotary motor are installed on it. The rotary motor can slide up and down along the drilling machine tower to provide lifting force and rotary driving force for the drill rod. The drill rod passes through the hollow structure of the rotary motor and is driven to move up and down and rotate. A drill rod is provided on the inner side of the lower part of the drill rod, and an inner vertical groove is provided on the inner side of the lower part of the drill rod.

[0010] One end of the multi-core rope is wound with a rope drum, and the other end passes through the rope sealing plug and the inside of the drill rod and is connected with the hole bottom vibrator. The inside contains a load-bearing steel wire, a cable and a signal transmission line, and the outside is provided with a circular plastic sealing outer skin, and the inside is filled with a filler.

[0011] The rope sealing plug is installed above the rotary motor, and the lower end is provided with a drill rod joint matched with the top of the drill rod, and the middle part is provided with a sealing ring capsule.

[0012] The hole bottom vibrator is installed on the inner side of the bottom of the drill rod, and the upper part is connected with the multi-core rope, and the lower part is connected with the sampling cylinder.

[0013] The sampling cylinder is located below the hole bottom vibrator.

[0014] The mud circulation system comprises a mud tank, a mud outlet pump, a mud outlet pipe, a borehole casing, a mud return pipe and a mud return pump. The mud tank has a slag separation function. Mud can enter the inside of the drill rod through the mud outlet pipe, and then flow back to the mud tank through the borehole casing and the mud return pipe to form a circulation.

[0015] Further, the hole bottom vibrator comprises a gas storage cavity, a telescopic support, an outer cylinder, a motor, a flywheel, a push-pull rod, a piston, a closed gas cavity, a piston hammer, an open gas cavity, a force transmission rod, an amplitude identifier and a flywheel cavity, which are formed by the outer cylinder, the motor and the piston, the volume of the gas storage cavity is greater than the sum of the volumes of the flywheel cavity and the open gas cavity, the telescopic support can be radially telescoped to fix the hole bottom vibrator, the motor drives the piston to move through the flywheel and the push-pull rod, the piston hammer reciprocates and hits the force transmission rod under the action of gas pressure, and the amplitude identifier can monitor the amplitude and transmit signals.

[0016] Further, the sampling cylinder comprises a connecting rod, a ball plug, a slurry overflow hole, a sampling cylinder body and a vertical rib outside the cylinder, the vertical rib outside the cylinder is arranged on the inner side of the sampling cylinder and is matched with the vertical groove in the rod, and the ball plug can move in the connecting rod to control the opening and closing of the slurry overflow hole.

[0017] Further, one side of the gas storage cavity is provided with a communication gas pipe I, and the other side is provided with a communication gas pipe II, the gas storage cavity is connected with the flywheel cavity through the communication gas pipe I and connected with the open gas cavity through the communication gas pipe II, and the closed gas cavity is formed by the outer cylinder, the piston and the piston hammer.

[0018] Further, the vertical groove in the rod is wide at the upper part and narrow at the lower part, and the lowermost part is of an equal-width structure; the vertical rib outside the cylinder of the sampling cylinder can slide into the vertical groove in the rod to realize torque transmission between the drill rod and the sampling cylinder.

[0019] Further, the bottom of the sampling cylinder body is open, the top is closed and is provided with a slurry overflow hole, the diameter of the slurry overflow hole is smaller than the diameter of the ball plug, and the lower part of the connecting rod is in the shape of a horn cylinder, the side wall of which is hollow and the hollow area is smaller than the diameter of the ball plug.

[0020] Further, more than two-thirds of the length of the orifice sleeve is nailed below the ground, and the upper end is exposed; one side of the upper part is connected with the slurry return pipe, and the inner diameter is greater than the outer diameter of the drill rod.

[0021] 2. A hole bottom vibration sampling method based on any of the devices, characterized by comprising the following steps:

[0022] S1. Preliminary preparation: nail the orifice sleeve into the predetermined position, install each component, connect the slurry return pipe, start and check the mud circulating system;

[0023] S2. Lowering of the sampling cylinder: release the multi-core rope, so that the hole bottom vibrator and the sampling cylinder sink in the drill rod, the vertical rib outside the cylinder of the sampling cylinder enters the vertical groove in the rod and fits, and the slurry flows out through the slurry overflow hole of the sampling cylinder;

[0024] S3 sampling operation: the motor of the hole bottom vibrator is started, the piston hammer hits the transmission rod to make the sampling cylinder vibrate into the stratum, the amplitude identifier monitors the amplitude and transmits signals, and the ground controller adjusts the motor frequency to make the sampling cylinder resonate with the stratum; when the stratum is hard, the telescopic support is started to fix the hole bottom vibrator, and the rotary motor is started to assist sampling;

[0025] S4 sampling cylinder lifting and mud circulation: after sampling is completed, the rope sealing plug is connected and the drill pipe top is inflated and sealed, the mud pump is started to pump mud into the drill pipe, and the mud circulation system works synchronously.

[0026] Further, during the sampling operation S, when the flywheel rotation drives the push-pull rod to move to different positions, the flywheel cavity and the open air cavity are in air communication with the air storage cavity through the communication air pipe, so as to reduce the air resistance of the movement of the piston and the piston hammer.

[0027] Further, during the lowering and lifting of the sampling cylinder S, the ball plug is respectively lifted to open the overflow hole under the action of the mud and lowered to close the overflow hole under the action of gravity and mud resistance.

[0028] Compared with the prior art, the present application has the following advantages:

[0029] 1. Improve the sampling quality: through the multi-core rope and the hole bottom vibrator, high-frequency small-stroke vibration of the sampling cylinder is realized, and disturbance to the soil sample is reduced. At the same time, the sampling cylinder is always located below the bottom of the drill pipe, avoiding disturbance to the sampling stratum by the drill pipe and mud, ensuring that the obtained soil sample is an undisturbed soil sample, and truly reflecting the original characteristics of the stratum, providing a reliable sample basis for subsequent geological analysis. Compared with traditional impact sampling, the risk of soil sample damage and deformation is greatly reduced, and compared with rotary sampling, the drill pipe does not need to be disassembled in sections, avoiding the indirect influence of the disassembly of the drill pipe on the surrounding stratum, thereby significantly improving the quality and usability of the sample.

[0030] 2. Ensure operation safety and stability: the rope sealing plug is arranged at the top of the drill pipe, cooperates with the circular plastic sealing outer skin of the multi-core rope, prevents mud overflow, and at the same time, the mud pump continuously pumps mud into the drill pipe, fills the pores formed when the sampling cylinder is lifted, and prevents the sampling stratum from collapsing.

[0031] 3. Improve work efficiency: With the flexible control of multi-core rope and the coordinated operation of drill pipe and hole bottom vibrator, the sampling time is greatly shortened. When facing different hardness of stratum, through the cooperation of amplitude identifier and ground variable frequency controller, the rotation frequency of motor can be quickly adjusted to make the sampling cylinder and the stratum reach the resonance state and speed up the sampling speed. When the stratum hardness is larger, the telescopic support and rotary motor assist the sampling cylinder to cut into the stratum, which further improves the sampling efficiency. The mud circulating system can maintain the stability of the drilling hole while lifting the sampling cylinder, without waiting for the drilling hole to be stable or performing additional supporting operation, ensuring the smoothness of continuous sampling. The design of the whole device effectively reduces the debugging time and failure rate of the equipment, significantly improves the efficiency of geological exploration work.

[0032] 4. Highlight environmental protection: The sludge separation device in the mud circulating system can effectively separate the sludge carried by the mud, realizing the multiple recycling of the mud. This not only reduces the waste of mud and reduces the exploration cost, but also avoids the pollution of a large amount of waste mud to the environment. Compared with the traditional geological exploration sampling method, the generation and discharge of mud waste are greatly reduced, which meets the green environmental protection concept and has a positive significance for protecting the surrounding ecological environment. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic diagram of the hole bottom variable frequency vibration sampling device in the application.

[0034] Figure 2 It is a working schematic diagram when the sampling cylinder sinks.

[0035] Figure 3 It is a working schematic diagram when the sampling cylinder is lifted.

[0036] Figure 4 It is a structure diagram of the hole bottom vibrator in the application.

[0037] Figure 5 It is a structure diagram of the sampling cylinder in the application.

[0038] Figure 6 It is a sectional view of the sampling cylinder in the application.

[0039] Figure 7 It is a schematic diagram when the piston is at the highest position.

[0040] Figure 8 It is a schematic diagram when the piston is descending.

[0041] Figure 9 It is a schematic diagram when the piston is at the lowest position.

[0042] Figure 10 It is a schematic diagram when the piston is ascending.

[0043] Figure 11 The figure shows the cross section structure of the multi-core rope in the present application.

[0044] As shown in the figure: 000, ground; 001, soil sample; 002, stratum

[0045] 1, hole bottom vibrator; 101, gas storage cavity; 102, telescopic support; 10301, communication gas pipe two; 10302, communication gas pipe one; 104, outer cylinder; 105, motor; 106, flywheel; 10601, flywheel cavity; 107, push-pull rod; 108, piston; 109, closed gas cavity; 1010, piston hammer; 1011, open gas cavity; 1012, force transmission rod; 1013, amplitude identifier;

[0046] 2, sampling cylinder; 201, connecting rod; 202, ball plug; 203, overflow hole; 204, sampling cylinder body; 205, vertical rib outside the cylinder;

[0047] 3, drill rod; 301, vertical recess in the rod;

[0048] 4, mud circulation system; 400, mud; 401, mud tank; 402, mud outlet pump; 403, mud outlet pipe;

[0049] 404, borehole casing; 405, mud return pipe; 406, mud return pump;

[0050] 5, multi-core rope; 501, rope drum; 502, load-bearing steel wire; 503, cable; 504, signal transmission line; 505, plastic outer sheath; 506, filler;

[0051] 6, rope sealing plug; 601, sealing ring bag; 602, drill rod joint;

[0052] 7, drilling machine chassis;

[0053] 8, drilling machine tower;

[0054] 9, rotary motor. DETAILED DESCRIPTION

[0055] The specific embodiments of the present application are further described below in conjunction with the accompanying drawings. The same reference signs are used for the same parts throughout the drawings.

[0056] It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0057] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0058] like Figures 1 to 11 As shown, the bottom hole vibration sampling device is characterized by including a bottom hole vibrator 1, a multi-core rope 5, a rope sealing plug 6, a sampling cylinder 2, a drill rod 3, a mud circulation system 4, a drilling rig chassis 7, and a drilling rig tower 8.

[0059] The drilling rig chassis 7 provides a supporting foundation for the device and outputs and processes electricity, compressed air, and mud circulation system 4. The mud circulation system contains mud 400. The drilling rig tower 8 is vertically installed on the drilling rig chassis 7, and a rope drum 501, a rope sealing plug 6, and a rotary motor 9 are installed on it. The rotary motor 9 can slide up and down along the drilling rig tower 8 to provide lifting force and rotation driving force for the drill rod 3. The drill rod 3 passes through the hollow structure of the rotary motor 9 and can move up and down and rotate under its drive. The lower part of the drill rod 3 is provided with an inner vertical groove 301.

[0060] One end of the multi-core rope 5 is wound around the rope drum 501, and the other end passes through the rope sealing plug 6 and the drill rod 3, and is connected to the bottom hole vibrator 1. Its interior contains a load-bearing steel wire 502, a cable 503 and a signal transmission line 504, and is provided with a circular plastic-sealed outer sheath 505. The interior is filled with a filling body 506.

[0061] The rope sealing plug 6 is installed above the rotary motor 9. The lower end is provided with a drill pipe joint 602 that is threaded to the top of the drill pipe 3. The middle part is provided with a sealing ring 601. When inflated, the sealing ring 601 is in contact with the plastic outer skin 505 of the multi-core rope 5 to seal the top of the drill pipe 3. When deflated, it is separated to open the top of the drill pipe 3.

[0062] The bottom hole vibrator 1 is installed on the inner side of the bottom of the drill rod 3. The upper part is connected to the multi-core rope 5, and the lower part is connected to the sampling cylinder 2. It includes an air storage chamber 101, a telescopic bracket 102, an outer cylinder 104, a motor 105, a flywheel 106, a push-pull rod 107, a piston 108, a closed air chamber 109, a piston hammer 1010, an open air chamber 1011, a force transmission rod 1012, and an amplitude identifier 1013. The volume of the air storage chamber 101 is much larger than that of the flywheel chamber 10601 and the open air chamber 1011. The telescopic bracket 102 can be radially extended and retracted to fix the bottom hole vibrator 1. The motor 105 drives the piston 108 to move through the flywheel 106 and the push-pull rod 107. The piston hammer 1010 reciprocates under air pressure to strike the force transmission rod 1012. The amplitude identifier 1013 can monitor the amplitude and transmit signals.

[0063] The sampling cylinder 2 is located below the hole bottom vibrator 1, including a connecting rod 201, a ball plug 202, a slurry overflow hole 203, a sampling cylinder body 204 and a vertical strip rib 205 outside the cylinder, which is matched with the vertical groove 301 inside the drill pipe 3, and the ball plug 202 can move in the connecting rod 201 to control the opening and closing of the slurry overflow hole 203.

[0064] The mud circulating system 4 includes a mud tank 401, a slurry outlet pump 402, a slurry outlet pipe 403, a borehole casing 404, a slurry return pipe 405 and a slurry return pump 406, the mud tank 401 has a sludge separation function, the slurry 400 can enter the inside of the drill pipe 3 through the slurry outlet pipe 403, and then flow back to the mud tank 401 through the borehole casing 404 and the slurry return pipe 405 to form a circulation.

[0065] The hole bottom vibrator 1 is installed in the bottom of the drill pipe 3, the upper part is connected with the bottom of the multi-core rope 5, the lower part is connected with the sampling cylinder 2, the hole bottom vibrator 1 is composed of a gas storage cavity 101, an extension support 102, a communication gas pipe two 10301, a communication gas pipe one 10302, a motor 105, a flywheel 106, a push-pull rod 107, a piston 108, a closed gas cavity 109, a piston hammer 1010, an open gas cavity 1011, a force transmission rod 1012 and an amplitude identifier 1013. The gas storage cavity 101 is located at the upper end of the hole bottom vibrator 1, is connected with the open gas cavity 1011 through the communication gas pipe two 10301 and the communication gas pipe one 10302, and the volume of the gas storage cavity 101 is much larger than that of the open gas cavity 1011, so that the air storage for the movement of the piston hammer 1010 is provided and the guiding effect is achieved. The extension support 102 is arranged at the lower part of the gas storage cavity 101 and can be radially extended and retracted, is consistent with the profile of the outer cylinder 104 and the gas storage cavity 101 when being retracted, and can abut against the inner wall of the drill pipe 3 to fix the hole bottom vibrator 1 when being extended. The outer cylinder 104 is installed at the lower part of the extension support 102, the piston 108 and the piston hammer 1010 are installed in the outer cylinder, and the two are tightly combined with the outer cylinder 104. The motor 105 is engaged with the flywheel 106 through a gear, the flywheel 106 is hinged with the push-pull rod 107 and the push-pull rod 107 is hinged with the piston 108, so that the horizontal rotation of the motor 105 is converted into the up-down movement of the piston 108. The closed gas cavity 109 is formed by the outer cylinder 104, the piston 108 and the piston hammer 1010, the lower end of the open gas cavity 1011 is connected with the force transmission rod 1012, and the piston hammer 1010 reciprocates along the inner wall of the outer cylinder 104 under the action of the pressure change of the closed gas cavity 109 and the open gas cavity 1011 to hit the force transmission rod 1012, so as to provide high-frequency small-stroke impact for the sampling cylinder 2. The amplitude identifier 1013 is installed at the bottom of the outer cylinder 104, monitors the amplitude of the outer cylinder 104 and the sampling cylinder 2 in real time, and transmits data to the ground variable frequency controller to adjust the rotation frequency of the motor 105, the ground variable frequency controller is used for controlling the rotation frequency of the motor of the hole bottom vibrator 1, in order to ensure the timeliness and stability of signal transmission, is installed in a place close to the drilling rig base plate 7 and having less signal interference, can facilitate the real-time monitoring and adjustment of parameters by the operator, can reduce the loss and interference in the signal transmission process, and can ensure the accurate control of the hole bottom vibrator 1.

[0066] Multi-core rope 5 and rope seal plug 6 assembly: multi-core rope 5 passes through rope seal plug 6, which is installed on the upper part of the rotary motor 9 of the drilling tower 8, and is provided with a drill pipe 3 joint at the lower part, which is connected with the threaded fastener on the upper part of the drill pipe 3 through internal threaded fastener; the middle part is provided with a sealing ring capsule 601, which can be tightly attached to the multi-core rope 5 when inflated to seal the top of the drill pipe 3, and separated from the multi-core rope 5 when deflated to open the top of the drill pipe 3; the inside of the multi-core rope 5 contains components for bearing, transmitting power and signals. The multi-core rope 5 transmits power and signals to the hole bottom vibrator 1 to realize hole bottom excitation, and when the hole bottom vibrator 1 and the sampling cylinder 2 are lifted, the rope seal plug 6 cooperates with the outflow pump 402 to continuously inject mud 400 into the drill pipe 3.

[0067] The sampling cylinder 2 is installed inside the drill pipe 3 below the hole bottom vibrator 1, and is composed of a connecting rod 201, a ball plug 202, a mud overflow hole 203, a sampling cylinder 2 body and a vertical rib 205 outside the cylinder. The upper part of the connecting rod 201 is sleeved with a joint, which is connected with the lower part of the hole bottom vibrator 1. The ball plug 202 is installed inside the lower part of the horn cylinder. The top of the sampling cylinder 2 body is provided with a mud overflow hole 203, and the bottom is open. The vertical rib 205 outside the cylinder is matched with the vertical groove 301 inside the drill pipe 3 at the bottom, so that the sampling cylinder 2 always remains at the bottom of the drill pipe 3 during sampling. The sampling cylinder 2 can enter the stratum 002 by means of high-frequency vibration of the hole bottom vibrator 1, or rely on the torque and pressure transmitted by the drill pipe 3 when the drill pipe 3 is pressed down and rotated, to ensure the integrity of the soil sample 001.

[0068] The mud circulating system 4 is composed of a mud tank 401, an outflow pump 402, an outflow pipe 403, a borehole casing 404, a backflow pipe 405 and a backflow pump 406. The mud tank 401 is installed on the drilling chassis 7, and is provided with a slag separation device inside. The outflow pump 402 delivers the mud 400 in the mud tank 401 to the inside of the drill pipe 3 through the outflow pipe 403. The borehole casing 404 is nailed into the ground, and its inner diameter is larger than the outer diameter of the drill pipe 3. The lower part of the borehole casing 404 is connected with the backflow pipe 405. The backflow pump 406 pumps the backflow mud 400 back to the mud tank 401, to realize closed circulation and recycling of the mud 400.

[0069] The hole bottom vibration sampling method is characterized by comprising the following steps:

[0070] S1 preliminary preparation: nail the borehole casing 404 into the predetermined position, install each component, connect the backflow pipe 405, start and check the mud circulating system 4;

[0071] S2 lowering of the sampling cylinder 2: release the multi-core rope 5, so that the hole bottom vibrator 1 and the sampling cylinder 2 sink in the drill pipe 3. The vertical rib 205 outside the cylinder of the sampling cylinder 2 enters the vertical groove 301 inside the drill pipe 3 and fits. The mud 400 flows out through the mud overflow hole 203 of the sampling cylinder 2;

[0072] S3 sampling operation: the motor 105 of the hole bottom vibrator 1 is started, the piston hammer 1010 hits the transmission rod 1012 to make the sampling cylinder 2 vibrate into the stratum, the amplitude identifier 1013 monitors the amplitude and transmits signals, the ground frequency converter adjusts the frequency of the motor 105 to make the sampling cylinder 2 resonate with the stratum, when the stratum is hard, the telescopic support 102 is started to fix the hole bottom vibrator 1, and the rotary motor 9 is started to assist sampling;

[0073] S4 sampling cylinder 2 lifting and mud circulation: after sampling is completed, the rope sealing plug 6 is connected and the top of the drill pipe 3 is inflated and sealed, the mud pump 402 is started to pump mud 400 into the drill pipe 3, and the mud circulation system 4 works synchronously.

[0074] During the sampling operation, when the flywheel 106 rotates to drive the push-pull rod 107 to move to different positions, the flywheel cavity 10601 and the open air cavity 1011 communicate with the air storage cavity 101 through the communication air pipe to reduce the air resistance of the movement of the piston 108 and the piston hammer 1010.

[0075] During the lowering and lifting of the sampling cylinder 2, the ball plug 202 is respectively lifted to open the overflow hole 203 under the action of the mud 400 and is lowered to close the overflow hole 203 under the action of gravity and the resistance of the mud 400.

[0076] In specific use, at a predetermined drilling position, the orifice casing 404 is vertically and stably nailed into the ground. The drilling machine chassis 7 is moved to a suitable position beside the orifice casing 404, and the drilling machine tower 8, the rotary motor 9, the drill pipe 3, the mud circulation system 4, the multi-core rope 5, the rope sealing plug 6, the hole bottom vibrator 1 and the sampling cylinder 2 are sequentially installed. The mud return pipe 405 is connected to the orifice casing 404, the mud circulation system 4 is started, and the key performances such as pressure, flow and sealing are comprehensively checked. By checking the performance indicators of the mud circulation system 4, it is ensured that the mud 400 can circulate smoothly, which provides stable guarantee for subsequent sampling work. If problems are found in the mud circulation system 4, it should be repaired and debugged in time until it operates normally;

[0077] When the sampling cylinder 2 needs to be lowered, the driving device of the rotary rope drum 501 is started to release the multi-core rope 5 at a stable speed. The softness of the multi-core rope 5 enables it to be smoothly released from the rotary rope drum 501, so that the hole bottom vibrator 1 and the sampling cylinder 2 slowly and stably sink inside the drill pipe 3. Since the sampling cylinder 2 is a hollow cavity, the mud 400 in the drill pipe 3 flows into the sampling cylinder 2, lifts the ball plug 202 and flows out from the overflow hole 203, reducing the falling resistance. During the sinking process, since the upper part of the vertical groove 301 in the bottom of the drill pipe 3 is wide and the lower part is narrow, the vertical strip rib outside the sampling cylinder 2 will first enter the upper wide groove of the vertical groove 301, and as the sampling cylinder 2 continues to sink, the vertical strip rib 205 will gradually move downward under the guidance of the upper wide groove of the vertical groove 301, and finally enter the lower equal-width groove, completing the fitting of the sampling cylinder 2 with the bottom of the drill pipe 3 and fully preparing for the subsequent rotary operation. At the same time, it is ensured that the sampling cylinder 2 is always below the bottom of the drill pipe 3, avoiding disturbance to the underlying stratum 002 by the drill pipe 3;

[0078] When the sampling operation is performed, the motor 105 of the hole bottom vibrator 1 is turned on, and the motor 105 obtains stable power supply through the cable 503 inside the multi-core rope 5 to realize horizontal rotation. The flywheel 106 below the motor 105 converts the horizontal rotation into vertical rotation to drive the push-pull rod 107 and the piston 108 to move, and then drive the piston hammer 1010 to move up and down. The piston hammer 1010 moves up and down repeatedly to hit the transmission rod 1012, and the transmission rod 1012 transmits the impact force to the sampling cylinder 2 to make the sampling cylinder 2 vibrate at a high frequency and small stroke below the bottom of the drill pipe 3 to cut into or press into the sampling stratum 002.

[0079] During this process, the amplitude identifier 1013 monitors the amplitude change of the outer cylinder 104 and the sampling cylinder 2 in real time, and transmits the data to the ground frequency converter through the signal transmission line 504 in the multi-core rope 5. The ground frequency converter automatically adjusts the rotation frequency of the motor 105 according to the received data until the outer cylinder 104, the sampling cylinder 2 and the stratum 002 reach the maximum amplitude, and locks the rotation frequency of the motor at this time, so that the end of the sampling cylinder 2 and the stratum 002 form resonance, and the speed of the sampling cylinder 2 cutting into the stratum 002 is accelerated. By adjusting the rotation frequency of the motor 105 in real time, the resonance of the sampling cylinder 2 and the stratum 002 is realized, which can effectively improve the sampling efficiency and reduce the disturbance to the soil sample 001.

[0080] The above describes the present application and its embodiments, which are not limited, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the present application.

Claims

1. A bottom hole vibrating sampling device characterized by: The device comprises a hole bottom vibrator (1), a multi-core rope (5), a rope sealing plug (6), a sampling cylinder (2), a drill rod (3), a mud circulating system (4), a drilling rig chassis (7) and a drilling rig tower (8); The drilling rig chassis (7) provides a support base for the device and provides output and processing support for power, compressed air and the mud circulating system (4), the drilling rig tower (8) is vertically installed on the drilling rig chassis (7), and the multi-core rope (5), the rope sealing plug (6) and the rotary motor (9) are installed on the drilling rig tower (8), the rotary motor (9) can slide up and down along the drilling rig tower (8) to provide lifting force and rotary driving force for the drill rod (3), the drill rod (3) passes through the hollow structure of the rotary motor (9) and is driven to move up and down and rotate, and the drill rod (3) is provided on the inner side of the lower part of the drill rod (3), and the drill rod (3) is provided with an inner vertical groove (301) on the inner side of the lower part of the drill rod (3); One end of the multi-core rope (5) is wound with a rope drum (501), the other end passes through the inside of the rope sealing plug (6) and the drill rod (3) and is connected with the hole bottom vibrator (1), the inside contains a load-bearing steel wire (502), a cable (503) and a signal transmission line (504), the outside is provided with a circular plastic sealing outer skin (505), and the inside is filled with a filler; The rope sealing plug (6) is installed above the rotary motor (9), and the lower end is provided with a drill rod joint (602) which is threadedly connected with the top of the drill rod (3), and the middle part is provided with a sealing ring bag (601); The hole bottom vibrator (1) is installed on the inner side of the bottom of the drill rod (3), the upper part is connected with the multi-core rope (5), and the lower part is connected with the sampling cylinder (2); The sampling cylinder (2) is located below the hole bottom vibrator (1); The mud circulating system (4) comprises a mud tank (401), a mud outlet pump (402), a mud outlet pipe (403), a borehole casing (404), a mud return pipe (405) and a mud return pump (406), the mud tank (401) has a sludge separation function, mud can enter the inside of the drill rod (3) through the mud outlet pipe (403), and then flow back to the mud tank (401) through the borehole casing (404) and the mud return pipe (405) to form a circulation.

2. The hole-bottom vibrating sampling device according to claim 1, characterized in that: The hole bottom vibrator (1) comprises a gas storage cavity (101), a telescopic support (102), an outer cylinder (104), an electric motor (105), a flywheel (106), a push-pull rod (107), a piston (108), a closed gas cavity (109), a piston hammer (1010), an open gas cavity (1011), a force transmission rod (1012), an amplitude identifier (1013), and a flywheel cavity (10601), which are enclosed by the outer cylinder (104), the electric motor (105), and the piston (108), the volume of the gas storage cavity (101) is greater than the sum of the volumes of the flywheel cavity (10601) and the open gas cavity (1011), the telescopic support (102) can be radially telescopic to fix the hole bottom vibrator (1), the electric motor (105) drives the piston (108) to move through the flywheel (106) and the push-pull rod (107), the piston hammer (1010) reciprocates under the action of gas pressure to hit the force transmission rod (1012), and the amplitude identifier (1013) can monitor the amplitude and transmit signals.

3. The hole-bottom vibratory sampling device of claim 1, wherein: The sampling cylinder (2) comprises a connecting rod (201), a ball plug (202), a slurry overflow hole (203), a sampling cylinder body (204), and a vertical rib (205) outside the cylinder, the vertical rib (205) outside the cylinder is arranged on the inner side of the sampling cylinder (2) and is matched with the vertical groove (301) in the rod, and the ball plug (202) can move in the connecting rod (201) to control the opening and closing of the slurry overflow hole (203).

4. The hole-bottom vibrating sampling device according to claim 2, characterized by: One side of the gas storage cavity (101) is provided with a communication gas pipe I (10302), and the other side is provided with a communication gas pipe II (10301), the gas storage cavity (101) is connected with the flywheel cavity (10601) through the communication gas pipe I (10302) and connected with the open gas cavity (1011) through the communication gas pipe II (10301), and the closed gas cavity (109) is sealed by the outer cylinder (104), the piston (108), and the piston hammer (1010).

5. The hole-bottom vibratory sampling device of claim 1, wherein: The upper part of the vertical groove (301) in the rod is wide, the lower part is narrow, and the lowermost part is an equal-width structure; the vertical rib (205) outside the cylinder of the sampling cylinder (2) can slide into the vertical groove (301) in the rod, so that the torque transmission of the drill rod (3) and the sampling cylinder (2) is realized.

6. The hole-bottom vibratory sampling device of claim 1, wherein: The bottom of the sampling cylinder body (204) is open, the top is closed and provided with a slurry overflow hole (203), the diameter of the slurry overflow hole (203) is smaller than the diameter of the ball plug (202), and the lower part of the connecting rod (201) is in the shape of a horn cylinder, the side wall of which is hollow and the hollow area is smaller than the diameter of the ball plug (202).

7. The hole-bottom vibratory sampling device of claim 1, wherein: More than two-thirds of the length of the orifice sleeve (404) is nailed below the ground (000), and the upper end is exposed; one side of the upper part is connected with the slurry return pipe (405), and the inner diameter is greater than the outer diameter of the drill rod (3).

8. A method of taking a sample from the bottom of a hole based on the apparatus of any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1 preliminary preparation: nail the orifice sleeve (404) into the predetermined position, install each part, connect the slurry return pipe (405), start and check the mud circulating system (4); S2: Lowering the sampling barrel (2): release the multi-core rope (5), make the hole bottom vibrator (1) and the sampling barrel (2) sink in the drill pipe (3), the outer vertical rib (205) of the sampling barrel (2) enters the inner vertical groove (301) of the drill pipe (3) and fits, and the mud flows out through the overflow hole (203) of the sampling barrel (2); S3: Sampling operation: start the motor (105) of the hole bottom vibrator (1), the piston hammer (1010) hits the transmission rod (1012) to drive the sampling barrel (2) to vibrate into the stratum, the amplitude identifier (1013) monitors the amplitude and transmits signals, and the ground (000) controller adjusts the frequency of the motor (105) to make the sampling barrel (2) resonate with the stratum; when the stratum is hard, start the telescopic support (102) to fix the hole bottom vibrator (1), and at the same time, start the rotary motor (9) to assist sampling; S4: Sampling barrel (2) lifting and mud circulation: after the sampling is completed, connect the rope sealing plug (6) and inflate the top of the drill pipe (3), start the mud pump (402) to pump mud into the drill pipe (3), and the mud circulation system (4) works synchronously.

9. The hole-bottom vibratory sampling method as claimed in claim 6, wherein: During the sampling operation (S3), when the flywheel (106) rotates to drive the push-pull rod (107) to move to different positions, the flywheel cavity (10601) and the open air cavity (1011) are in air flow with the air storage cavity (101) through the communication air pipe, so as to reduce the air resistance of the piston (108) and the piston hammer (1010) movement.

10. The method of hole-bottom vibratory sampling according to claim 8, wherein: During the lowering (S2) and lifting of the sampling barrel (2), the ball plug (202) respectively rises to open the overflow hole (203) under the action of the mud and descends to close the overflow hole (203) under the action of gravity and mud resistance.

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